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Siemens 3RU7126-1JB0 — Overload Relays

Siemens 3RU7126-1JB0 SIRIUS Thermal Overload Relay, CLASS 10

MPN3RU7126-1JB0

Siemens SIRIUS thermal overload relay, size S0, CLASS 10, rated operational current 10 A, screw terminals, 3RU7126-1JB0.

Siemens 3RU7126-1JB0 datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RU7126-1JB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationThermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
3RU7126-1JB0 — Protection & Trip
ParameterValue
Overload current setting range7 ... 10 A
Trip classCLASS 10
Overload release typethermal
3RU7126-1JB0 — Electrical (main circuit)
ParameterValue
Rated operational current10 A
Poles (main circuit)3
Rated operating frequency50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)690 V
Rated surge withstand voltage6 kV
Main current circuitscrew-type terminals
Power loss at rated current (hot)6.6 W
Per pole2.2 W
3RU7126-1JB0 — Auxiliary contacts
ParameterValue
Switching current at 24 V3 A
Switching current at 230 V2 A
3RU7126-1JB0 — Connection & Mounting
ParameterValue
Mounting / fastening methodContactor mounting
Mounting positionwith vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back
Main-circuit connector arrangementTop and bottom
Auxiliary/control circuit connection typescrew-type terminals
Conductor cross-section: solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
3RU7126-1JB0 — Environmental
ParameterValue
Operating temperature-20 ... +55 °C
Transport temperature-25 ... +70 °C
Relative humidity, operating0 ... 90 %
Max. installation altitude2 000 m
3RU7126-1JB0 — Mechanical
ParameterValue
Width45 mm
Height97 mm
Depth96 mm

Product details

The Siemens 3RU7126-1JB0 is a SIRIUS thermal overload relay in size S0, CLASS 10, rated at 10 A operational current. It mounts directly onto a S0 contactor (fastening method: contactor mounting), forming a compact motor starter package for a DIN-rail panel.

Mounts directly onto a S0 contactor (contactor mounting). The mounting position allows vertical surface installation with ±135° rotation and ±45° tilt forward/backward. Required spacing to grounded parts at the side is 6 mm.

Ratings & Environment

Rated operational current 10 A at AC, 690 V operating voltage, 50/60 Hz. Three poles for the main current circuit. Trip class CLASS 10. Ambient operating temperature -20 to +55 °C; transport/storage -25 to +70 °C. Humidity 0 to 90% during operation. Installation altitude up to 2000 m. Surge voltage resistance 6 kV. Power loss 6.6 W typical at rated current. Screw terminals for main and auxiliary circuits.

Frequently asked questions

Where can I buy 3RU7126-1JB0 and how do I get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quote.

When sourcing 3RU7126-1JB0, what's the closest functional second-source — 3RU2116-1FC1?

The 3RU2116-1FC1 is a SIRIUS thermal overload relay in size S00, not S0. It will not directly drop into a panel designed for the S0-footprint 3RU7126-1JB0 without mechanical adaptation. The S00 frame is physically smaller and mounts to S00 contactors, not S0.

What is 3RU7126-1JB0's listed depth (96 mm) on this component line?

The listed depth is 96 mm.

What is 3RU7126-1JB0's listed width (45 mm) on this component line?

The listed width is 45 mm.

Will 3RU7126-1JB0 drop into a panel that was specified around 3RU2116-1FC1 without rewiring?

No. The 3RU2116-1FC1 is a size S00 relay; the 3RU7126-1JB0 is size S0. The S0 frame has different mounting holes and terminal spacing. Mechanical adaptation is required.

What compliance documentation does this brand provide for 3RU7126-1JB0 (RoHS, REACH, UL, IEC)?

The evidence does not list specific compliance documentation for this order code. Standard Siemens SIRIUS documentation applies; confirm with your Siemens contact for RoHS/REACH/UL declarations specific to this variant.

MPN
3RU7126-1JB0